Hot-air conduit.



W. W. HANOLD.

HOT AIR GONDUIT Patented Feb. 23, 1909.

APPLICATION FILED DBO. 4, 1906.

UNITED STATES PATENT OFFICE.

WILLIAM WALDRON HANOLD, OF NEW YORK, N. Y., ASSIGNOR TO H. JOHNS-MANVILLE COMPANY, A CORPORATION OF NEW YORK.

HOT-AIR CONDUIT.

Specification of Letters Patent.

Patented Feb. 23, 1909.

To all whom it may concern:

Be it known that I, \VILLIAM W. HANOLD,

a citizen of the United States ofAmerica,

and a resident of the borough of Brooklyn, county of Kings, city and State of New York, have invented certain new and useful Im )rovements in Hot-Air Conduits, of \vhlch the following is a specification.

My inventionrelates generally to heat insulation and more specifically comprises an improved conduit for containing and conveying heated air.

It has its most important application in the heating of buildings by what is known as the indirect method of steam heating. In plants operating on this method, air is propelled by natural or forced draft over a coil of steam pipes, or a set of steam radiators, or other steam containing vessels through conduits to the various rooms to be heated. It is highl desirable that these conduits should not ra iate the heat of their contents, and it has been heretofore the practice to make them of metal and cover the same with a non-heat conducting covering.

, I This construction is heavy, costly and awkward. I have invented a form of chamber and conduit for this purpose which avoids these difiiculties.

The best form of apparatus embodying my invention at present known to me is illustrated in the accompanying sheet of drawings in which:

Figure 1 is a perspective, partly sectional view of a portion of a building with m invention applied thereto. Fig. 2 is a etail perspective view of a conduit embodying my invention with parts broken away. Fig.

3 is a detail perspective view of a piece of the preferred form of material used in praclike reference uit 5, and register 6, into the held in, or fastened to a skeleton frame of an le iron or other fireproof material of su 'cient tensile strength. The preferred material employed by me is that shown in Fig. 3, and consists of alternate sheets .of flat and corrugated asbestos paper fastened together, preferably with the corrugations of alternate sheets running at right angles one to another. This material is light in weight, strong, and easily cut to size and per orated for the passage of bolts, or rivets, without destroying its structure or strength. Pieces, 7, of this material cut to size are inserted in the skeleton frame 8 of angle iron which is riveted or 'bolted to ether, as best shown in Fig. 2. The slabs of material may be so shaped that they will interlock within the skeleton frame and so retain their positions therein, or they may be bolted to the angle iron flan es by bolts 10, 10, or otherwise fastened t ereto.

In operating invention, the steam ram diator 3 is heated Ii y steam and the current of air heated by radiation and convection therefrom flows out of the chamber and through the conduit 5 without losin any appreciable portion of its heat, as it oes not come in contact with any cold metal or other 00d conductor of heat. It is entirely con ned within the non-conducting walls of asbestos ipaper or other non-conducting, non-resonant reproof material and so retains all of its heat until it reaches the room to be heated. The conduits do not transmit sound as the present metal ones do, acting as speaking tubes and magnifying sounds. Besides preventing loss of the heat of the air, this improved conduit, being formed of cheap material, easily worked, costs little to construct and being light in weight, does not burden the building or the transporting agencies.

Any other strong, fireproof material might be substituted for iron in the framework, and other forms of fireproof non-resonant material might be used in place if asbestos ge}? l en 1t is necessary to carry the hot air considerable distances from the heating chamber 9 to the point of delivery, the conduit shown in Fig. 2 may be employed.

Having, therefore, described my invention, I claim: In a system for heating by hot air, the

combination with a steam radiator of an inl 7' Signed at New York, N. Y., this 3rd day closing casing therefor comprlsmg a skeleof December, 1906. ton frame of angle iron and slabs ormed of a series of layers of plain and corrugated WILLIAM WMDRON HANOLD- asbestos paper bolted to said angle iron in- Witnesses: side of the skeleton frame and forming con- A. PARKER-SMITH,

tinuous walls for said casing. v M. G. Cmwrono. 

